VW Touran Power Loss: Bad Boost Control Signals Trouble

Had the same boost-related symptoms on my 2018 VW Arteon 2.0 TSI. After thorough diagnosis, it turned out to be a faulty vacuum switching valve connected to the bypass valve system. The symptoms perfectly match, reduced engine performance, increased fuel consumption, and that characteristic turbo lag when accelerating. The vacuum switching valve controls the boost pressure and when it fails, the bypass valve cant regulate pressure properly. This affects the entire intake manifold system, leading to inconsistent boost pressure and poor engine performance. This is actually a common issue with these engines. While not a catastrophic problem, it needs proper attention since continuous driving with faulty boost control can stress other engine components. The repair involves replacing the boost solenoid and testing the entire pressure control system to ensure proper function. When looking for repair, focus on workshops that specialize in VW turbo engines. They should have the right diagnostic tools to properly test the boost pressure control system. Make sure they perform a complete pressure test to rule out any leaks in the intake system. The fix typically requires replacing the valve assembly and recalibrating the engine management system. Its not a complex repair for someone who knows these engines.

Thanks for sharing your experience with the Arteon. This is really helpful as I was dealing with similar compressor surge issues and pressure drop problems on my Touran just last month. The symptoms you described match exactly what I experienced, poor engine performance and that annoying lag during acceleration. I finally got it fixed last week and the difference is night and day. Would you mind sharing how much you ended up paying for the repair? Also curious if youve had any other vacuum leaks or boost-related problems since getting it sorted? My mechanic mentioned keeping an eye on the intake manifold pressure readings during the first few weeks after repair.

Good to hear you got it sorted. After seeing my mechanic, the boost pressure control fault was completely resolved by replacing the vacuum switching valve, which cost 140€ including labor. The repair fixed the compressor surge issues and eliminated all pressure drop problems. The boost controller has been working flawlessly since the fix, no more turbo lag or inconsistent acceleration. My fuel consumption returned to normal levels too. Six months later and everything is still running perfectly with no vacuum leaks or boost-related issues. Smart move having your mechanic monitor the intake manifold pressure readings. I did the same for about a month after my repair. Its a good way to catch any potential problems early. The bypass valve system is pretty reliable once properly fixed, but keeping an eye on performance parameters during the break-in period is always wise.

Thanks for the feedback. After all your advice, I wanted to share how my repair experience went. Found a specialized VW workshop that really knew their stuff about turbo systems. They diagnosed a failing boost controller and also spotted a small vacuum leak in the intake. Total repair came to 380€, more than I expected but worth every cent. They replaced the faulty parts and did a complete pressure sensor calibration. The technician showed me the actual diagnostic readings before and after, pretty eye-opening to see how bad the pressure control had gotten. Been driving for two weeks now and what a difference. No more turbo lag, and the engine pulls strong again. Fuel consumption is back to normal too. The compressor surge issues are completely gone. Really glad I didnt put this repair off any longer. The mechanic explained how running with boost pressure problems could have caused bigger issues down the line. Sometimes paying a bit more for proper diagnosis and repair saves money in the long run.